WO2021144123A1 - Canule veineuse à demeure - Google Patents

Canule veineuse à demeure Download PDF

Info

Publication number
WO2021144123A1
WO2021144123A1 PCT/EP2020/087404 EP2020087404W WO2021144123A1 WO 2021144123 A1 WO2021144123 A1 WO 2021144123A1 EP 2020087404 W EP2020087404 W EP 2020087404W WO 2021144123 A1 WO2021144123 A1 WO 2021144123A1
Authority
WO
WIPO (PCT)
Prior art keywords
venous catheter
venous
cannula
indwelling
vein
Prior art date
Application number
PCT/EP2020/087404
Other languages
German (de)
English (en)
Inventor
Jens EBNET
Original Assignee
Ebnet Medical Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebnet Medical Gmbh filed Critical Ebnet Medical Gmbh
Priority to EP20842219.6A priority Critical patent/EP4076614A1/fr
Priority to US17/786,835 priority patent/US20230020179A1/en
Priority to CN202080095919.7A priority patent/CN115052650A/zh
Publication of WO2021144123A1 publication Critical patent/WO2021144123A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0017—Catheters; Hollow probes specially adapted for long-term hygiene care, e.g. urethral or indwelling catheters to prevent infections
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
    • A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
    • A61M25/0026—Multi-lumen catheters with stationary elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/02—Holding devices, e.g. on the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06—Body-piercing guide needles or the like
    • A61M25/0606—"Over-the-needle" catheter assemblies, e.g. I.V. catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M29/00—Dilators with or without means for introducing media, e.g. remedies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
    • A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
    • A61M2025/0024—Expandable catheters or sheaths
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/02—Holding devices, e.g. on the body
    • A61M2025/0213—Holding devices, e.g. on the body where the catheter is attached by means specifically adapted to a part of the human body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/02—Holding devices, e.g. on the body
    • A61M2025/0266—Holding devices, e.g. on the body using pads, patches, tapes or the like
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids

Definitions

  • the invention relates to an indwelling venous cannula for application to a living being with a venous catheter, wherein a puncture needle can be guided longitudinally in the venous catheter.
  • DE 4041 720 A1 describes an indwelling venous cannula with a venous catheter and a puncture needle displaceable therein, the front part of the venous catheter penetrating into the body made of stainless steel and the rear part made of a flexible material such as plastic.
  • the invention is therefore based on the object to provide an improved Venenverweilka tube.
  • the invention is also based on the object of creating an improved puncture system in the sense of a general puncture system.
  • it is also possible to advantageously puncture all body cavities and interbody spaces and all anatomical and diseased structures that are to be punctured and to insert a catheter into them.
  • indwelling venous cannula is to be retained in the following, but has a more extensive meaning in the sense of a general puncture system with which not only veins can be punctured.
  • veins in the following therefore also includes in principle all body cavities and interbody spaces and all anatomical and diseased structures which are to be punctured and provided with a catheter.
  • the trachea, pleural space, abdomen, intestines, renal pelvis, urinary bladder and bones can also be punctured with the indwelling venous cannula according to the invention.
  • pathological structures such as abscesses in and on the living being can be punctured.
  • the indwelling venous cannula can either be removed immediately after the puncture or left for some time. Arterial blood vessels can also advantageously be punctured.
  • the puncture needle of the indwelling venous cannula be designed as a hollow needle over part of its length, with a further part of the length of the puncture needle being at least partially solid.
  • a hollow needle allows the user to aspirate blood during and after the puncture in order to check immediately during and after the puncture whether the corresponding vessel has already been correctly punctured.
  • the other part of the length can also be completely solid forms.
  • the puncture needle is thus in particular not made hollow over the entire length or part of the puncture needle is solid. Massive can mean in particular that the puncture needle is not hollow. It is particularly conceivable that an end of the puncture needle close to the vein is solid, that is to say impermeable to a fluid.
  • the puncture needle prefferably be hollow only in an upper area.
  • This cavity can be connected to the environment close to the vein via an upwardly pointing recess / opening or via several such recesses / openings.
  • a part close to the vein can in particular be the part that faces the living being.
  • the tip of the puncture needle is, for example, a part of the puncture needle close to the vein.
  • a part remote from the vein can be that part which faces the user of the intravenous cannula.
  • This recess can be a defined distance away from the tip of the puncture needle, which is therefore not itself directly on a cavity of the puncture needle lies or does not go directly into one itself.
  • the recess can be arranged on the side of the puncture needle, for example.
  • the venous catheter is now advanced over the puncture needle without further advancement of the puncture needle in the direction of the vein, a proper position of the venous catheter is not necessarily achieved.
  • the venous catheter can then, for example, be pushed past the vein unintentionally. This risk can be reduced by the further development just mentioned.
  • the risk of the punched-out skin particles being carried over into the vein can be reduced, since a puncture needle that is not completely hollow can reduce the risk of a skin cylinder being punched out.
  • the unintentional perforation of the second wall of the vein lying below or behind is nevertheless very unlikely, since the recess is not far away on the part of the puncture needle that reaches the blood vessel when it is advanced.
  • the recess can be, for example, 0.5-5 millimeters from the portion of the puncture needle that is closest to the vein. This portion close to the vein can be designed in the form of a point of a puncture needle with any cut.
  • the indwelling venous cannula can be a catheter system for puncturing the pleural space, the trachea, the urinary bladder, the gastrointestinal tract, for puncturing reservoirs, pumps, hose systems, tube systems or port systems.
  • the indwelling venous cannula can be a catheter system for use in the field of interventional radiology, in the field of interventional cardiology or in the field of emergency, disaster or tactical and military medicine.
  • the indwelling venous cannula can be set up for invasive measurement of the arterial blood pressure.
  • the application range of the intravenous cannula according to the invention extends to all common intravenous cannulas in human medicine, including pediatric intravenous cannulas and those in veterinary medicine.
  • the intravenous cannula according to the invention should also enable intravenous cannulas with larger diameters than conventional intravenous cannulas. These can, for example, be assigned to a defined inner diameter of the venous catheter using colored primers and selected by the operator depending on the application.
  • At least part of the venous catheter which is set up to linger in the living being, can be made of a puncture-proof material over its entire length or most of its length, in which the puncture needle can be moved longitudinally, or be coated with such a puncture-proof material .
  • the puncture resistance of the material relates to a possible puncture of the venous catheter through the puncture needle, which is to be prevented by the puncture-proof material.
  • the puncture-proof material can be a metal, also in the form of a metal alloy, or a corresponding puncture-proof plastic material or natural material.
  • plastic materials for example, carbon fiber reinforced laminate materials, polymers and / or Teflon come into question, also in combination with one another.
  • aramids can also be used to provide puncture resistance.
  • This also includes, for example, aramid fibers, in particular para and meta-aramid fibers.
  • the puncture-proof material can in particular no longer be present in the immediate (distal) end of the venous catheter near the patient.
  • the thickness of the puncture-proof material and / or the material density does not have to be constant over the entire longitudinal extent over which the puncture-proof material is present on the venous catheter, but can vary over the length.
  • the puncture-proof material does not have to be available everywhere. Gaps can be deliberately left, e.g. to create a kind of "target kink".
  • the puncture-proof material can be formed, for example, by a tubular metal body or a metal coating of a base material of the venous catheter, which can be a plastic material, for example.
  • the metal can for example be steel, for example stainless steel, or titanium or an alloy formed therewith or a bimetal.
  • the puncture-proof material is arranged on the inside of the venous catheter, ie the puncture-proof material forms the inner wall of the venous catheter.
  • a protective layer of the venous catheter which surrounds the puncture-proof material to the outside can be formed from plastic, for example.
  • the puncture-proof material is arranged on the outside of the venous catheter.
  • the puncture-proof material is arranged both on the inside and on the outside of the venous catheter.
  • the puncture-proof material can thus form either the inner or outer wall of the venous catheter or both.
  • the puncture-proof material is advantageously made from a material that has non-thrombogenic properties.
  • the puncture-proof material can be coated with an additional surface which has non-thrombogenic properties.
  • the puncture-proof material can be designed as a metal layer, also as a metal alloy (alloy).
  • the puncture-proof material is also magnetic resonance tomography (MRT) compatible, so that the lying venous catheter or the components of the venous cannula embedded in the body remain in the body even during an MRI examination and do not damage or damage it during the MRI examination also cannot dislocate in the magnetic field.
  • MRT magnetic resonance tomography
  • the venous catheter is not too stiff due to the puncture-proof material, ie it continues to have a certain flexibility.
  • such materials can make the venous catheter compatible with MRT / magnetic resonance imaging. If the indwelling venous cannula is not made completely metal-free or MRT-compatible, it is conceivable that the indwelling venous cannula is made from materials that are, for example, partially MRT-compatible, ie may only be used in certain MRT devices.
  • the venous catheter can also be used as a ventilation tube and endotracheal tube.
  • all the advantages described can be used to provide a bite-proof and kink-proof ventilation tube and endotracheal tube. This can be particularly advantageous for pediatric patients, for example. It is important that a possible spiral structure is formed from a material that cannot be bitten through and, in the event of unintentional damage, does not form or give off any sharp or pointed structures. It is advantageous if the material of the spiral structure is coated with a softer material, for example, or the spiral structure is connected to other materials of the venous catheter.
  • the spiral-shaped structure is only formed over a part of the length of the venous catheter or that it is only found in a semicircular shape in the wall of the same.
  • a venous catheter designed in this way can have a connector remote from the vein / close to the user to which a (further) ventilation hose or further airway aids can be connected.
  • the end of the venous catheter immediately close to the vein can be designed in such a way that it is no longer designed in the form of an edge-like structure, but rather in the form of a slightly bead. It can also be designed in the manner of a brim, bent or turned inside out. It can also comprise a flexible material or even a foam or gel-like mate rial, as well as a less tightly wound coil spring. It can also comprise a particularly atraumatic material.
  • the puncture resistance has the advantage that the indwelling venous cannula is designed to be puncture, kink and cut resistant. This minimizes the risk of damage to the venous catheter.
  • the indwelling venous cannula can thus be reused after a faulty puncture with the same living being under permanent sterile conditions, since even with repeated displacement of the puncture needle against the venous catheter in the longitudinal direction, the latter does not pass through the tip of the patient near the patient Puncture needle can be damaged. This poses a problem with conventional venous indwelling cannulas.
  • the tip of the puncture needle close to the patient can cause the venous catheter or parts of it to shear off in the longitudinal direction, especially when the puncture needle is repeatedly advanced towards the venous catheter.
  • a displaceability of the puncture needle in the direction of the vein can be completely or partially prevented due to the design.
  • Such a mechanism can take effect, for example, if the puncture needle has already been moved away from the vein from its original position, which is maximally close to the vein.
  • a non-puncture-proof venous catheter can then no longer be sheared off or damaged in whole or in part by the tip of the puncture needle close to the vein, since it can then no longer (and in particular no longer be pushed repeatedly) towards the vein.
  • All of the layers of the intravenous cannula just mentioned advantageously have non-thrombogenic properties. In addition, they advantageously have hypoallergenic and / or antimicrobial properties. All layers can also advantageously consist of a very slippery material or be coated with such a material. A refinement of the layers or surfaces using nanotechnological processes is explicitly possible.
  • the venous catheter can be formed from a self-sealing material or material layers.
  • a part of the venous catheter, which is set up to linger in the patient, can be made of a material or coated with a material that is pierced over its entire length or the predominant part of its length in which the puncture needle is longitudinally displaceable can, but immediately closes completely again after being pierced.
  • This can also be achieved in that the material used has elastic properties.
  • a superplastic deformability of this material can be given, as well as great toughness.
  • the material can have a very smooth surface so that fluids can flow without turbulence and the surrounding structures, such as the vein wall, are also irritated as little as possible.
  • the material can also have thrombogenic (clot-forming / coagulation-activating) properties, so that a puncture channel is closed by the body's own, in particular blood-specific components, e.g. platelets or fibrin.
  • the venous catheter can consist of several layers, with only the inner layers having thrombogenic properties and the outer non-thrombogenic properties. It is also possible for only one layer to have thrombogenic properties and only one further layer to have non-thrombogenic properties.
  • the arrangement of the layers is basically variable, depending on the desired properties of the venous catheter.
  • the result is a venous catheter with biological properties, the wall of which closes itself, but which prevents the formation of a thrombus that is too large and which could clog the lumen of the venous catheter.
  • the venous catheter consists of several layers, a kind of "cooler phenomenon" can occur, i.e. if the venous catheter is unintentionally punctured, the puncture site is sealed off by shifting layers of the wall of the venous catheter against each other and thereby sealing it. It is therefore conceivable that the layers can be displaced relative to one another due to the design.
  • It can advantageously be a material which does not emit or release any particles or other constituents even in the event of mechanical or other irritation.
  • the venous catheter and / or the puncture needle can be designed as a venous catheter and / or puncture needle that unfolds or enlarges through the body heat.
  • the body heat can increase the volume of the catheter. This can cause the outside diameter of the venous catheter to increase. The inside diameter can also increase, but also decrease.
  • the venous catheter and / or the puncture needle can also contain an expandable gas or a sterile liquid in its wall, which produces the properties mentioned above.
  • the venous catheter and / or the puncture needle can also be designed to be inflatable or inflatable.
  • Venous catheters and / or puncture needles can also experience a reduction in volume due to the body heat.
  • the indwelling venous cannula can have at least one holding element for easier application to a living being, the holding element having a complementary shape or a negative contour of a human thumb or a human fingertip.
  • the indwelling venous cannula can be further developed in an ergonomically advantageous manner for the user.
  • the indwelling venous cannula can have a fastening element, the fastening element being configured to fix the indwelling venous cannula on the living being, the fastening element having an adhesive or adhesive surface or an adhesive or adhesive coating to fix the indwelling venous cannula on the living being.
  • the intravenous cannula cannot be accidentally pulled out of the punctured body part of the living being.
  • the administration of medication is also made easier because the venous cannula is held fixed on the patient without being unstable.
  • the venous cannula can for example be fixed to the living being via a self-adhesive wound dressing via the fastening element. In this way, the intravenous cannula can be fixed directly to the patient's skin after it has been placed.
  • a removable protective film can protect the surface until the IV cannula has reached the position at which it is to be fixed.
  • the venous catheter of the intravenous cannula can have an undulating surface.
  • a wavy surface is shaped at least in cross section along the longitudinal axis of the venous catheter by alternating diameters of the venous catheter.
  • a waveform can consist of a sine, square, triangle and / or sawtooth wave, for example. It is also advantageous if the venous catheter has a spiral structure and / or is provided with a spiral structure. Due to the spiral structure, the venous catheter has great flexibility, which makes it easier to apply it to living beings. In this way, an indwelling venous cannula is provided which is designed to be both cut and puncture resistant and flexible.
  • the venous catheter and / or the puncture needle can have a spiral structure and / or be provided with a spiral structure, the spiral structure having windings, the density of the windings varying over the length of the venous catheter and / or the puncture needle.
  • a desired quality can be achieved depending on the application, especially with regard to the flexibility and rigidity of the venous catheter.
  • a tightly wound venous catheter can achieve a high degree of rigidity with a high level of puncture security. If the venous catheter is wound less tightly, the flexibility increases.
  • venous catheters By varying the density of the windings of the venous catheter, sections with less tight windings can also be set up in a conscious manner. This creates “crumple zones” in the venous catheter that are more flexible. For example, the venous wall can be less irritated by the venous catheter.
  • venous catheters can be used that optimally adapt to the course of the veins.
  • a venous catheter with “crumple zones” can also optimally adapt to patient movements.
  • the venous catheter can also have telescopic properties or be designed in the form of a ramp. Its diameter can also change in the direction of the vein or in the opposite direction.
  • the density of the windings can also be adjusted by the user if necessary by pulling the wound venous catheter apart or together. It is also possible that the density of the windings at different points of the venous catheter is already different due to the design and thus already varies with the flexibility and rigidity of the venous catheter, especially in the longitudinal course, due to the design.
  • the venous catheter in the area of the transition from the venous catheter to the skin, can be designed differently than in the areas further close to the vein. For example, it can only have a wavy surface in this area or it can be reinforced with other structures or elements.
  • windings can be designed in such a way that they run parallel or almost parallel. However, other forms of winding, including those with an overlapping winding, are also possible. Opposite windings or windings with different angles of rise are also conceivable. In contrast to parallel windings, windings with a rise angle are inclined, i.e. the windings are not oriented essentially orthogonally to a longitudinal axis of the windings, but at an angle of rise with respect to the longitudinal axis. Braid-like structures are also possible.
  • the venous catheter can also be formed with one or more removable layers. If these are removed, the inner diameter and / or the lumen of the venous catheter increases. In this way, layers of the venous catheter that are colonized with germs or provided with blood clots can easily be removed. However, it is also possible that layers can be introduced from the outside in this way and thus the venous catheter can be supplemented with further layers.
  • the venous catheter can, for example, contain several inner tubes that can be removed as required.
  • the inner tubes can, however, also be designed with a very thin wall, so that they can be removed without a large change in the inner diameter of the venous catheter. You can be designed like a film here. In this context, one can also speak of “onion skin-like”. As a result, the inner wall of the venous catheter can be provided with a new wall several times, which has fluid and blood contact.
  • the venous catheter can also consist of an absorbable or dissolvable material, e.g. a carbohydrate, over its entire length or part of its length, or be coated with such a material.
  • This material can give the venous catheter a certain hardness, and the tip close to the vein can also be made hard by such a material so that it can be easily advanced into the vein. When it comes into contact with blood, the material is absorbed, i.e. dissolved in the blood. This means that less hard structures can be released.
  • a venous catheter can be made hard and then soft before it is inserted into the patient and in particular before it is inserted into the vein.
  • An outer absorbable or dissolvable (hereinafter only “dissolvable”) layer or substance around the venous catheter which can also have an antimicrobial effect, can also be advantageous because a venous catheter is contaminated by germs when inserted through the skin despite sterile conditions, which are located, for example, directly under the skin and are not accessible to skin disinfection. If an outer layer of the venous catheter contaminated with germs dissolves in the patient and in particular in the blood, germ contamination of the patient for a limited period of time, for example in the blood stream, can occur. However, these can no longer remain on the venous catheter, multiply there and form biofilms, for example.
  • the venous catheter can be connected to a Part of its length or its entire length may be surrounded by an outer dissolvable layer.
  • the puncture needle can be made of a resorbable material and become soft after being inserted into the patient and the vein.
  • the puncture needle itself can represent the venous catheter. It is then possible for the puncture needle to be designed like a venous catheter and to have corresponding properties.
  • the end of this modified puncture needle near the vein can then be formed from a hard, dissolvable material which forms the tip. It is also possible to create a cut, e.g. a triangular cut. Upon contact with the patient and in particular with the vein, the material is dissolved and the other parts of the puncture needle are exposed.
  • the puncture needle can now be used directly as a venous catheter.
  • the dissolvable material can also initially block the inside of the puncture needle and thus ensure that no particles or e.g. punched out skin cylinders are carried into the vein.
  • the intravenous cannula consist of a dissolvable material or are coated with such a material.
  • the dissolvable material can, for example, be a carbohydrate, in particular glucose, sucrose, amylose and / or starch.
  • the end of the puncture needle close to the vein can consist of a resorbable or dissolvable material, for example one of the carbohydrates described above, or be coated with such a material. This dissolves in the patient or in the bloodstream. In this way, the puncture needle becomes blunt when it is in the patient. It is also possible for the fluid flow through the puncture needle or, analogously, the fluid flow through a venous catheter to be interrupted or blocked by rapid dissolution of the resorbable material. In this way, unwanted administration of a fluid into a blood vessel can be avoided. This can be relevant if a fluid or a substance, for example, may only be applied under the skin (subcutaneously). An indwelling venous cannula in the conventional design may no longer be necessary since the puncture needle, due to its absorbable properties, already forms the venous catheter and can be left in the vein for use.
  • the venous catheter and / or the puncture needle can, for example, be wound up like a spiral spring made of a metal, the individual layers can lie close to each other so that they are in contact with each other. This is similar to the structure of the already known Seldinger wire, which consists of a tight is made of coiled steel wire. Due to the tightly wound layers, the venous catheter is cut and puncture resistant and flexible at the same time.
  • the spiral spring can also be designed in such a way that a kind of "wind kettle effect" arises, i.e. the spiral spring and venous catheter can compensate for pressure fluctuations through elasticity. This also makes it possible to prevent or at least minimize the unwanted release of large amounts of liquid in a short time. It is, for example, conceivable that the mentioned property of the spiral spring, e.g. by expanding it or increasing the diameter, will open at least one opening through which the unintentionally flowing fluid can now be drained off. A kind of intermediate storage of the too much inflowed fluid in the venous catheter itself with later removal by the user is also possible.
  • the coil spring prefferably designed so that it is removed after the venous catheter has been inserted into the vein or after it has reached its desired end position, ie it can be pulled out of the venous catheter in the longitudinal direction away from the vein .
  • the spiral spring is detached or detachable from the latter due to its own special material properties or those of the rest of the venous catheter is. These can be thermoplastic properties, for example, but the spiral spring can also be slidable.
  • the puncture needle can be designed according to a Seldinger wire, but additionally with a puncture tip, which is introduced into a vein or into another anatomical structure of a patient and via which a catheter can be introduced into the patient.
  • a Seldinger wire can accidentally remain in a patient as a complication if it is forgotten to remove it after inserting a catheter, which it internally serves as a guide wire and thus a guide rail.
  • a new type of Seldinger wire is proposed, which can advantageously be further developed at its venenfer NEN end with the following features: a) The vein-remote end can be bent, angled, hooked, looped, J- or U-shaped or vice versa J- or be U-shaped. It is advantageous here if the end remote from the vein is made very flexible and user-friendly so that a catheter can be quickly threaded over this. If the catheter is then threaded, the end remote from the vein temporarily takes on the shape of the catheter, which is generally straighter. Passes the catheter now the even longer Seldinger wire in its full length, this again assumes the shape described in the first sentence under a) at its end remote from the vein.
  • the end of the Seldinger wire distant from the vein can no longer pass the end of the catheter distant from the vein, as it does not fit in here due to its shape.
  • the shape of the inside of the loop which is then concave compared to the lying catheter, ensures that the Seldinger wire modified in this way is only subjected to an active bending movement through the Venous catheter can be pushed. Unintentional disappearance of the Seldinger wire in the venous catheter is prevented by the fact that the inside of the loop of the Seldinger wire hits the end of the venous catheter remote from the vein.
  • an inverted conventional Seldinger wire is described, which already has a J-shaped structure at its end near the vein.
  • an element protruding from the wire can be attached, which must be actively pushed down by the user so that a catheter can be threaded onto the Seldinger wire.
  • This element can be provided with a spring mechanism and also rectangular, container, stamp or ramp-shaped. If the catheter is now over this element and closes the Seldinger wire at this point, the element is pressed in the direction of the wire and the catheter can be pushed over the wire.
  • the Seldinger wire can also be wound differently at its end remote from the vein over a defined length or have a larger diameter. It can also be particularly compressible or expandable over a defined length.
  • a type of plug or an element that enlarges the circumference of the end of the Seldinger wire remote from the vein can be attached via a connector or even without a connector, which is attached when the catheter has passed the wire in the direction of the vein. It can also be a cylindrical or disk-like element with an inner cavity through which the Seldinger wire is passed.
  • the venous catheter has grooves, such as a corrugated tube, distributed over the circumference, which provide a wavy surface.
  • the grooves ver run continuously over the entire circumference of the venous catheter and are arranged in front of geous parallel at even or uneven intervals over the length of the venous catheter.
  • the venous catheter thus has a changing diameter. In this way it is possible that the venous catheter can be aligned in different positions.
  • the grooves can extend spirally distributed over the circumference. Such spiral grooves have the advantage that the pressure loss of a fluid guided through the venous catheter is reduced and at the same time a swirling of the fluid can be achieved.
  • the venous catheter can advantageously be developed with one or more reinforcement layers. It can thereby be achieved that its lumen / inner diameter can no longer be compressed / squeezed in any way by external influences.
  • the venous catheter can now also be securely sewn on directly with a thread without the venous catheter being "constricted".
  • venous indwelling cannula Due to the above-mentioned properties of the venous indwelling cannula, it may also be possible to initially leave a puncture needle withdrawn into the venous catheter in order to puncture deeper structures at a later point in time.
  • the venous catheter can have a sensor at an end near the vein. For example, data on the living being, such as blood pressure, can be transmitted via the sensor are recorded.
  • This can be connected to components of the venous catheter, for example a spiral structure, in an electrically conductive or data-transferring manner.
  • the spiral structure can already be designed as a sensor.
  • the senor it is also possible for the sensor to have a flat or wave-shaped structure.
  • the spiral spring can also be designed to be electrically non-conductive or consist of an electrically non-conductive material. It is also possible to coat the spiral spring with an electrically insulating material.
  • a sensor that detects when the distance between the venous wall and the venous catheter is too small can also be attached to the end of the venous indwelling cannula, in particular the venous catheter, which is close to the vein. In this way, the position of the venous catheter or the entire indwelling venous cannula can be corrected, possibly also automatically corrected. It is conceivable that this sensor also has an alarm function that can be used to warn of blood clots or other structures, e.g. bacterial associations.
  • This also prevents or at least reduces the risk of further trauma and, for example, unwanted puncture of the venous wall when the venous catheter is already in the desired position.
  • a clamping element can be arranged on the venous catheter, the clamping element being configured to interrupt a fluid flow through the venous catheter.
  • a clamping element can already be permanently integrated into all components of the vein cannula.
  • the venous catheter of the intravenous cannula can have a dilatation body at an end near the patient for uniform expansion of a punctured body part.
  • This has the advantage that the venous catheter can be inserted into the punctured body part of the living being without additional widening of the puncture site, by inserting the dilatation body over the venous catheter or into the venous catheter integrated dilatation body is pushed together with the venous catheter over the puncture needle into the punctured body part, whereby the necessary dilation takes place and the venous catheter can be pushed further into the body part.
  • the dilatation body can taper at an acute angle of less than 11 degrees, based on a 360 ° system.
  • the angle relates to the angle between two outer dilatation surfaces of the dilatation body and not to the central axis of the dilatation body.
  • the dilatation body can advantageously taper at an acute angle of less than 10.5 degrees. This has the advantage that the venous catheter can be inserted into the punctured body part easily and without additional widening of the puncture site by pushing the dilation body over the puncture needle into the punctured body part, with the necessary dilation taking place and the venous catheter being pushed into the body part can.
  • the dilatation body tapers at an acute angle of less than 11 degrees, in particular less than 10.5 degrees, so that it can be advanced through the skin during the dilatation process.
  • the dilatation body consists of a material or is coated with a material that reduces the frictional resistance in order to facilitate advancement of the dilatation body. It is also conceivable that after the dilation body has been introduced into the punctured body part, it is widened and thus the puncture site is widened in such a way that the venous catheter can be pushed into the punctured body part.
  • the dilatation body prefferably be designed in a shape that enables the vein and / or a puncture site and / or a puncture channel (hereinafter only “puncture channel”) to expand in stages.
  • the dilatation body can be designed in such a way that its diameter changes, for example increases, from near the vein to far away from the vein. This can be done continuously or in stages. In the latter case, the diameter is initially constant over a certain distance until a caliber jump occurs. This sequence can be repeated several times until the end of the dilatation body remote from the vein is reached.
  • there is an element at the location of the caliber jump which element indicates the location of the caliber jump.
  • This element can also be designed in such a way that it encompasses the dilatation body at the location of the caliber jump, for example also encloses it in a circular manner.
  • this element must first be overcome or pushed by the user to another location on the dilatation body. This ensures that the jump in caliber is noticed by the user. This can now decide whether a further widening of the puncture channel is necessary.
  • An aspiration element or a tube element can also be connected to the end of the dilatation body remote from the vein, if necessary via a connection or extension element. If the dilatation body is hollow, the correct position in the vein can be checked when the puncture channel is widened by aspirating or sucking blood through the dilatation body with the aid of an aspiration element, e.g. a syringe. If a guide wire that completely fills the lumen of the dilatation body is not used, this can happen continuously. However, it is also possible to use a guide wire which is hollow on the inside and through which blood is aspirated. It is also possible to first introduce the dilatation body with the aid of a guide wire, then to remove this guide wire in the further course and then to push the dilatation body even deeper into the vein with constant aspiration.
  • an aspiration element e.g. a syringe.
  • blood can be aspirated permanently or as required via the lying dilatation body when the puncture channel is widened.
  • a puncture channel can be gently widened in stages through a single dilatation body without having to thread several dilatation bodies with increasing diameters sequentially onto a guide wire and remove them again.
  • a puncture needle is located in a venous catheter, it is also possible for a puncture needle projecting beyond the venous catheter in the longitudinal direction in the direction of the vein to be designed as a dilatation body and to have the properties mentioned above.
  • Another structure can, for example, also be designed in the form of an applicator or sponge or foam or gel ring that partially or completely surrounds the components of the dilatation body and wets them with a friction-reducing or antimicrobial substance before or during insertion into the vein.
  • the venous catheter of the indwelling venous cannula can have recesses distributed over the circumference at the end near the patient for the homogeneous supply of a fluid into the living being.
  • This has the advantage that, for example, the application of a drug into the body of the living being can be carried out more homogeneously than with conventional intravenous cannulas, so that the drug does not concentrate undesirably in one place.
  • the withdrawal of e.g. blood or other liquids is better possible, as well as drainage of e.g. secretions or air, depending on the respective application.
  • the venous catheter can be curved or angled, in particular at the end immediately close to the vein.
  • the venous catheter can also be designed in a J-shape, whereby it can be designed to be flexible in particular in the area of the J-shape, also more flexible than at its other sections. But it can also be formed from a U-shape. This property can only be seen when the venous catheter is advanced over the puncture needle, since the venous catheter is in close contact with the straight puncture needle in the starting position and the venous catheter formed in this way is splinted by the puncture needle in the starting position.
  • the bent or angled end of the venous catheter close to the vein can be designed here at such that when the venous catheter is advanced via the puncture needle, a desired direction of advance is specified.
  • the end of the venous catheter close to the vein never hits the wall of the blood vessel directly when a desired position in the blood vessel is already sufficient.
  • the vein wall can therefore not be punctured unintentionally so easily.
  • the bend or angling can be eliminated by external influences.
  • the recesses of the venous catheter can here be arranged at the point at which the angling or curvature of the venous catheter is maximal. As a result, fluids to be infused, for example, continue to follow the direction of flow away from the venous catheter into the blood vessel.
  • the recesses can also be designed as flap-like elements (hereinafter “flaps”) and / or connected to them. It is advantageous here if the flaps exert a valve action and / or control the flow of fluids in an advantageous manner. In this way, the flow of fluids through the flaps can also be redirected.
  • flaps flap-like elements
  • the venous catheter of the indwelling venous cannula according to the invention can also have at least two separate lumens in addition to a single-lumen design.
  • the puncture needle is passed through one of the lumens.
  • the structure of the puncture-proof material described above can also be adapted to the existence of the lateral exit holes, e.g. in a ring around the exit holes in order to additionally stabilize them or to keep them open.
  • the recesses on the venous catheter can be closed by flexible structures that can be operated by the user close to the user.
  • Spring, cable or stent-like mechanisms can be used here.
  • the venous catheter can nevertheless be partially or completely further formed by a material or coated with such a material which is permeable to fluids, gases or vapors. It is possible that this material has braided or lattice-like structures and therefore has a permeability. It can also have very small recesses, including pores, for example. These structures can all be very small. For example, nanostructures can be used. It is also possible to use structures which are only selectively permeable to certain fluids, gases, vapors or substances.
  • the recesses / exit holes can also be arranged at the top and bottom of the venous catheter.
  • several connection elements are also advantageous for connecting an aspiration element or several aspiration elements.
  • connection element or the connection elements can be arranged on the indwelling venous cannula in such a way that they point away from the patient's skin at a certain angle, for example at a 90 degree angle or at a 45 degree angle.
  • the lumen through which the puncture needle is guided in the venous catheter can preferably lie centrally between the other lumens.
  • the venous catheter can have an outer lumen which partially or completely surrounds all the other lumens on the outside in a circular or semicircular shape and / or lies under the outer wall of the venous catheter.
  • This lumen can now have recesses arranged over part of the length or the entire length of the venous catheter, through which a fluid can be applied once, repeatedly or continuously.
  • This lumen is primarily intended for the supply of fluids or substances, e.g. antimicrobial and / or thrombus-dissolving substances, which are intended to wet the venous catheter from the outside or, in general, to act on it from the outside and on its surroundings.
  • fluids or substances e.g. antimicrobial and / or thrombus-dissolving substances
  • deposits on the venous catheter can be removed or washed away. Germ colonization can also be prevented or at least reduced.
  • This lumen can be specially marked on the intravenous cannula, since its recesses cannot necessarily come to lie in the vein.
  • a rinsing solution can also be applied continuously via the lumen; it can then be called a "rinsing lumen", for example. It is also possible that the recesses of this lumen are directly adjacent to the other recesses of the venous catheter so that fluids and substances can be applied in their immediate vicinity.
  • a local anesthetic and / or antimicrobial substances can be introduced into the patient's body continuously or for a limited time by means of the indwelling venous cannula. In this way, for example, a reduction in pain when inserting or leaving the indwelling venous cannula can be achieved.
  • the indwelling venous cannula or the venous catheter can contain a material over the entire length or at defined points or be coated with such a material which is visible in an X-ray image and thus allows an exact position control of the indwelling venous cannula or the venous catheter in the body.
  • the venous catheter of the venous indwelling cannula can have a connection element for connecting an aspiration element, such as a syringe, for example, the venous catheter having a structure, the structure being designed to be locked with the aspiration element.
  • an aspiration element such as a syringe
  • aspiration can be used to check at any time whether the venous catheter is in the target structure of the living being.
  • aspiration of blood can be used to verify whether the venous catheter of the intravenous cannula is still in a blood vessel.
  • a connection element enables a simplified administration of medication.
  • a connection element at the end of the venous indwelling cannula remote from the vein for connecting an aspiration element can be designed in such a way that, in addition to a conventional element for screwing on or plugging in an aspiration element, it contains an element with an additional securing mechanism.
  • Such a securing element ensures that disconnections between the indwelling vein cannula and the aspiration element and / or other elements connected to the indwelling venous cannula (hereinafter referred to as the "aspiration element"), e.g. infusion tubes, are reliably prevented.
  • the securing element can have a stop which prevents a rotation or twisting off of an aspiration element from the intravenous cannula.
  • the stop can cooperate with at least one path limiting element.
  • the interaction of the stop with the path limiting element provides a fixing device, a maximum angle of rotation of the fixing device of the aspiration element being limited. If a stop attached to the aspiration element comes to rest on the path limiting element, the aspiration element can no longer be rotated in the respective direction of rotation.
  • path limitation elements e.g. at least two path limitation elements.
  • These can be shaped and operated in different ways (e.g. can be pressed down). In particular, they can also have a locking function.
  • the path-limiting element can also be designed in such a way that it is connected to the indwelling venous cannula via a spiral spring.
  • the spiral spring can be sunk in a cylindrical recess / hole in the intravenous cannula. This makes it possible to actively press the path-limiting element in the direction of the indwelling venous cannula and thus temporarily actively cancel the effect of the path-limiting element in order to still be able to actively turn a stop over the path-limiting element.
  • the path limiting element itself can be designed, for example, in the form of a stamp or a ramp, but other shapes are also conceivable.
  • an aspiration element engages in a structure of the venous indwelling cannula and thus disconnection is impossible. It is also advantageous if this structure can differentiate between a venous and arterial location or function.
  • a mechanism can also be designed which automatically interrupts a flow of fluid if there is no aspiration element on the intravenous cannula.
  • the venous catheter is advanced in the direction of the vein over the internal puncture needle by rotary movements, for example of a connection element or another component of the indwelling venous cannula.
  • Interlocking gears or gear-like elements (hereinafter referred to as “gear” / “gears”) can be used for this.
  • This can be advantageous in the case of difficult venipuncture, if the venous indwelling cannula and in particular the puncture needle have to be stabilized with one hand and the venous catheter has to be advanced precisely over the puncture needle in the direction of the vein with the other hand.
  • connection element can be arranged on the upper side of the intravenous cannula in an area that cannot be introduced into a patient.
  • connection element can be hollow on the inside and be designed with a cover which is connected to the connection element via a tab.
  • the rotatable connection element can, for example, be inserted at its lower section into the cavity of the venous indwelling cannula, which forms the extension of the venous catheter in the longitudinal direction away from the vein towards the user.
  • the lower portion of the rotatable connection element can be further formed with a gear.
  • the venous catheter can run up to this section or in the longitudinal direction away from the vein in the direction of the user beyond this ver and be provided with a gear.
  • connection element When the connection element is rotated about its own longitudinal axis, the venous catheter is now displaced in the longitudinal direction.
  • the venous catheter can also be rotated about its own longitudinal axis.
  • the puncture needle can be moved accordingly by analogy.
  • the puncture needle can also be formed as a curved and / or angled hollow needle. In particular, it can also be designed in the shape of a spiral spring.
  • the venous catheter surrounding the puncture needle can have sufficient flexibility and robustness to also surround a puncture needle that is not straight adapt to their shape. Thus, the venous catheter can also be bent, angled and / or spiral spring-shaped in the starting position before, during or after use on the patient.
  • the components designed in this way and to be introduced into the patient are introduced into the patient by means of a rotary movement.
  • the axis of rotation runs orthogonally to the skin surface.
  • the entire indwelling venous cannula can also be bent, angled and / or spiral spring-shaped. However, it is also possible that in particular the components of the venous indwelling cannula remote from the vein continue to be straight.
  • the puncture needle and / or venous catheter may contain straight sections between curved, angled or spring-shaped sections. It is also possible that curved, angled or spring-shaped sections are combined with one another as desired. A screw-like structure of all the components just mentioned is also conceivable.
  • a venous catheter If a venous catheter is now advanced in the direction of the vein over the puncture needle, it can also assume its original shape, e.g. a linear shape. It can also take a certain shape or steer in a certain direction due to its construction.
  • a curved, angled and / or spiral spring-shaped puncture needle alone or combined with a venous catheter in an indwelling venous cannula is used where the position in a vein is not absolutely necessary.
  • it could be used as a subcutaneous catheter, injection and / or infusion system in palliative medicine. In this area, the subcutaneous administration of medication and infusion solutions is very important.
  • a subcutaneous catheter system designed in this way can only be designed with a connection element for an aspiration element, for example a syringe. It is also conceivable that only one at the end of the vein Infusion line can be attached, for example via a plug-in or rotary connection and / or via a connector designed in another way.
  • the puncture needle need not be made of a metal.
  • it can also consist of a plastic material with sufficient hardness. This can advantageously have thermoplastic properties. This can make it softer when it is pushed or is in the vein.
  • the puncture needle can also consist of different materials in sections and / or not be made hard over a defined distance.
  • the puncture needle in such a design can have one or more arranged recesses distributed over the circumference at the end near the vein, through which a homogeneous delivery of a fluid, e.g. a medicament or an infusion solution, into the patient can be achieved. Blood can also be withdrawn through the recesses.
  • a fluid e.g. a medicament or an infusion solution
  • An expansion body for fixing the venous catheter in the punctured body part can be arranged on the venous catheter of the venous indwelling cannula.
  • Such an expansion body can be designed, for example, as an inflatable cuff, as a so-called cuff, which is arranged, for example, on the outside of the venous catheter.
  • a cuff can seal the Venenverweilka from the outside by inflating the cuff under the skin or filling it with liquid and thus sealing the puncture system from the outside and also advantageously fixing it in its position.
  • Such an expansion body can, however, also be formed on the inside of the venous catheter and, if necessary, line the inside of the venous catheter and, for example, seal and / or block it against blood flowing back.
  • the expansion body can be designed as a cuff, sleeve or as a sleeve, for example as a Dacron sleeve. It can also be through a small hose or catheter of its own, which is integrated into the venous catheter, for example, or guided along it can be filled with a fluid and / or a gas and / or steam via a connection element with an aspiration element, for example a syringe.
  • a pressure measuring device can also be connected to the connection element.
  • the connection element is here advantageously developed with a valve, which prevents a spontaneous retrograde leakage of the fluid and / or the gas and / or vapor. However, these substances can be actively withdrawn from the expansion body, e.g. also with the help of an aspiration element.
  • the indwelling venous cannula can have a hollow extension element, it being possible for a fluid to flow through the hollow extension element to reduce thrombus formation. If a fluid such as a saline solution flows through the extension element and thus the venous catheter, thrombi are prevented from forming in the venous catheter, which would make it impossible to use the indwelling vein cannula.
  • a stylet which is arranged within the venous catheter or can be inserted into it, is designed to be hollow.
  • the hollow stylet can protrude in length beyond a venous catheter when it is inserted into the latter.
  • its end near the vein can protrude beyond the end of the venous catheter near the vein.
  • the hollow mandrin can have recesses distributed over the circumference for the homogeneous supply of a fluid into the living being. Blood can also be taken from the vein through these recesses.
  • a connection element can be attached to the end of this hollow stylet that is remote from the vein.
  • An aspiration element for example a syringe, can be connected to this.
  • a stop element for example in the form of a flag, can be attached at this point so that the hollow stylet cannot be pushed too far in the longitudinal direction in the direction of the vein or accidentally lost in the patient.
  • the hollow stylet can also be used as a guide wire. It can have a length of up to 600 cm and can advantageously also be developed with an internal core.
  • the core which can be made in one or more parts, does not have to be designed over the entire length of the hollow mandrin.
  • the core can completely or partially fill the interior of the hollow stylet and can also consist of several parts, sections or components.
  • the core can be removable.
  • the hollow stylet can therefore be used both as a robust guide wire and as a catheter through which fluids can be passed.
  • the hollow stylet can also be used as a respiratory aid, e.g. as a ventilation hose or as an endotracheal tube. It can also be used in the context of tracheotomies or cricothyrotomies.
  • An additional airway aid e.g. a resuscitation bag, can be connected to its end near the user via a connector or without such a connector.
  • the hollow stylet can also remain in the venous catheter of the venous indwelling cannula as an inner tube, even for a longer period of time. It is then conceivable that it will be replaced on a regular basis, e.g. to prevent infection or thrombus formation.
  • the hollow stylet can also be surrounded by a protective cap.
  • the hollow stylet can be mounted in this protective cap in a longitudinally displaceable or rotatable manner or in a completely flexible manner.
  • the protective cap can also be designed in such a way that it has lamellar and / or telescopic properties. In this way, it can be left in place to protect the hollow stylet during the insertion process, and when the hollow stylet passes through the venous catheter it automatically collapses since it cannot pass through it itself.
  • a protective cap designed in this way can also protrude length and circumference of the hollow mandrin in the direction of the vein before the start of the insertion process. This provides protection against infection, which protects the patient and user before the start of the intentional insertion process.
  • the hollow mandrin is kept germ-free or at least low-germ before the start of the intended insertion process.
  • the protective cap can also be designed as a flexible protective cover or as a bag.
  • the protective cap / protective cover can be designed so that it can be torn open or split.
  • the protective cap can also comprise only part of the length of the hollow mandrin and be attached to the hollow mandrin so as to be displaceable in the longitudinal direction. It can then be connected to the hollow stylet via a loop.
  • the protective cap unfolds again in the longitudinal direction and surrounds all sections of the hollow stylet. This creates a system that is closed outside of the patient / the intravenous cannula. This prevents the user from coming into contact with the patient's blood.
  • the end of the protective cap close to the vein can be in the form of a container, a stamp or a bead, for example.
  • a rim-like or ramp-like shape is also conceivable.
  • a special shape prevents the protective cap itself from getting into the area of the venous catheter during the insertion process.
  • the end of the protective cap close to the vein can be designed to be tiltable or in such a way that the sides can be flexibly moved independently of one another. This makes it possible to insert the hollow stylet into the venous catheter from different insertion angles.
  • the protective cap can also be designed in the form of a retractable protective cover or some other flexible structure. This can also be mixed with a friction-reducing, antimicrobial and / or locally anesthetic substance or contain this. It can also be made of a suitable material or be provided with a corresponding surface that has these properties.
  • the protective cap can also be designed in the form of an applicator or sponge or foam or gel ring, which wets the components of the hollow stylet to be inserted into the venous catheter, e.g. with a friction-reducing, anti-adhesive, antithrombogenic, antimicrobial and / or local anesthetic substance.
  • a venous catheter that has already been used for a long time for example, can advantageously be processed antimicrobially or antithrombogenic from the inside.
  • the protective cap that surrounds the hollow stylet can also have the properties listed below. It can also surround a puncture needle, venous catheter and / or all other components of an indwelling venous cannula or all other catheters and devices.
  • the indwelling venous cannula can have a safety mechanism that is set up to shield the tip of the puncture needle after removing the puncture needle from the venous catheter.
  • a shield prevents the user or the living being from injuring themselves at the point of the puncture needle after it has been pulled out of the intravenous cannula after the puncture has taken place.
  • the puncture needle of the intravenous cannula can be surrounded by a protective cap, which is removed before the intravenous cannula is used. In this way undesired injuries when handling the intravenous cannula can be avoided.
  • venous catheter and / or other components of the venous indwelling cannula are also surrounded by a protective cap.
  • the protective cap can be designed in such a way that it has lamellar or telescopic-like properties. In this way, the protective cap to protect the venous catheter can be left during the puncture and automatically pushes together when the venous catheter passes, since it cannot pass through the skin itself when the venous catheter is advanced.
  • a protective cap designed in this way can also project length and circumference beyond the tip of the puncture needle in the direction of the vein before the start of the puncture process. This provides stab protection that protects the patient and user from the beginning of the puncture process, which is in the process of being inclined.
  • the puncture needle is kept sterile or low in germs before the intended puncture process begins.
  • the protective cap When removing the venous catheter, possibly also when removing it with the puncture needle in the event of an unsuccessful puncture, the protective cap unfolds again in the longitudinal direction and surrounds all sections of the venous catheter and the puncture needle.
  • the end of the protective cap close to the vein can be in the form of a container, a stamp or a bead, for example.
  • a rim-like or ramp-like shape is also conceivable.
  • a special shape prevents the protective cap from getting below the skin level during the puncturing process.
  • the end of the protective cap close to the vein can be designed to be tiltable or in such a way that the sides can be flexibly moved independently of one another. This makes it possible to introduce the intravenous cannula into the patient from different puncture angles.
  • the protective cap can also be designed in the form of a retractable protective cover or some other flexible structure. This can also be mixed with a friction-reducing, anti-adhesive, antithrombogenic, antimicrobial and / or locally anesthetic substance or contain it. It can also consist of a corresponding material or be provided with a corresponding surface that has these properties.
  • the protective cap can also be designed in the form of an applicator or sponge or foam or gel ring, which wets the components of the intravenous cannula to be introduced into the living being, e.g. with a friction-reducing, antimicrobial and / or local anesthetic substance. It is also possible to use a puncture-proof film.
  • the protective cap can also be designed in such a way that it only protrudes over part of the venous catheter and, after the puncture has been performed, for example, is pushed in the direction of the vein in order to protectively accommodate the end of the venous catheter or the puncture needle in its interior. This is particularly relevant in the event of an incorrect puncture, when the intravenous cannula with venous catheter and puncture needle must be safely disposed of.
  • the protective cap can also be combined with a hollow stylet.
  • the indwelling venous cannula can have a stab protection for the puncture needle.
  • the puncture protection ensures, at least when the intravenous cannula is new, that the user cannot injure himself at the tip of the puncture needle.
  • the stab protection can be designed similar to the protective cap.
  • Depth markings can be made on the venous catheter. The depth markings allow the user to check the insertion depth of the catheter on the patient.
  • the venous catheter can also have a stop ring applied to it in order to limit the insertion depth of the catheter to a defined distance.
  • the puncture needle and / or the venous catheter can be rotatably mounted about its own longitudinal axis.
  • the puncture needle can be freely rotatable about its own longitudinal axis in any position in which it is displaced in the longitudinal direction relative to the venous catheter. It can be freely rotatable about its own longitudinal axis, particularly when it is fully advanced in the direction of the vein to be punctured.
  • the puncture needle can, however, in particular when fully advanced in the direction of the vein to be punctured, also in fixed predetermined positions, for example a rotation by 90 °, 180 °, 270 ° and / or any rotation from 0 ° to 360 ° around its own longitudinal axis , be adjustable.
  • the end of the venous indwelling cannula remote from the vein can, for example, contain corresponding devices, e.g., notches, which interact with a holding element or handle at the end of the puncture needle remote from the vein, e.g. interlock / snap into one another in specific, precisely defined positions.
  • a braking effect arises when the puncture needle is in certain positions and / or is rotated around its own longitudinal axis in a special angular range. For example, it is possible that turning the puncture needle in a range from 270 ° to 360 ° requires greater user force than turning it in a range from 0 ° to 90 °. It is also conceivable that the puncture needle automatically returns to a 0 ° position again and again by a spring mechanism when it is deflected from this by a user and then released.
  • the rotatable mounting of the venous catheter can have the advantage that, for example, components of the venous catheter that are misplaced / blocked by anatomical structures, e.g. Entry or exit holes, rotated / moved away from the relocating / blocking structures, without having to move or remove the entire indwelling venous cannula.
  • anatomical structures e.g. Entry or exit holes
  • Puncture needle and venous catheter can also be connected to one another in such a way that they are only rotatably mounted together / combined.
  • the venous catheter is connected to the other components of the venous indwelling cannula in a longitudinally displaceable manner or is mounted in the longitudinally displaceable in the indwelling venous cannula.
  • the longitudinal displacement can be limited by at least one path limiting element. This can have all the properties that are described in this document with regard to path limiting elements. This can have the advantage that the venous catheter can also adapt to further patient movements in a desired end position.
  • An application is also conceivable in such a way that, before the start of the puncture, the length over which the puncture needle protrudes near the venous catheter can be set precisely.
  • angles As far as angles are given in degrees, they refer to a circle of 360 degrees (360 °).
  • the angle information can be made recognizable for the user on a component of the intravenous cannula so that, for example, the current angle of the puncture needle or the venous catheter can be read off.
  • Circular or semicircular markings with different line widths and e.g. colored markings in the traffic light colors "green", “yellow” and red "are conceivable here.
  • the indwelling venous cannula can, for example, advantageously be further developed individually or in combination using the following materials or material classes, substances, materials, elements, etc. (hereinafter referred to as “materials”). It is possible that all components of the venous indwelling cannula, in particular the venous catheter and / or the puncture needle, are made of or contain the following materials, individually or in combination with one another: - Biocompatible metals and polymers, biopolymers
  • Nitinol nickel-titanium alloy
  • thermoplastic elastomers TPE
  • TPE-A thermoplastic elastomers
  • thermoplastic polyurethanes TPU
  • PS Polystyrene
  • PC polycarbonate
  • PEBA polyether block amide
  • PE Polyethylene
  • PVDF polyvinylidene difluoride
  • ABS - Acrylonitrile Butadiene Styrene
  • MABS acrylonitrile butadiene styrene
  • Fibers and biodegradable materials are also possible.
  • Films, laminates and / or fabric inlays can also be used.
  • Resorbable / dissolvable or drug- or substance- / substance-releasing materials can also be used.
  • materials release, contain or are coated with antimicrobial, anti-inflammatory, chemotherapeutic and / or local anesthetic substances. This also applies, for example, to substances with an anti-thrombogenic effect, such as heparin, which can prevent the formation of blood clots on and near the venous catheter.
  • the surface structure and chemistry of the surface can be optimized.
  • a hydrophilic or hydrophobic coating can be advantageous.
  • the above materials can also be used on the venous catheter in a locally varying manner.
  • the tip of the venous catheter can be made of a softer material with thermoplastic properties.
  • the tip of the venous catheter can also deliberately be made of a harder material in order to facilitate advancement into the vein.
  • materials can be connected through technical processes and / or merge into one another at one or more points on the indwelling venous cannula.
  • a spiral spring at the end of the venous catheter that is immediately close to the vein with a surrounding, internal or external material.
  • Such a connection or fusing can take place in the area of the entire venous catheter. This can prevent the coil spring from breaking.
  • Materials with a suitable toughness can advantageously be used here.
  • venous catheter Materials that expand at body temperature and / or swell in the vicinity of a fluid, that is to say increase in volume, can also advantageously be used.
  • bentonite can be used.
  • Such an effect can be used, for example, at the end of the venous catheter close to the vein: When the venous catheter is inserted, it is sharp-edged at the end close to the vein and lies close to the puncture needle. When the venous catheter is placed in the vein as intended, it swells at the end near the vein and is less likely to damage the vein wall. It is also possible that the venous catheter can swell over a further section or over the entire length. It is also possible that the puncture needle can swell as just described and thus change its properties, e.g. defuse itself and is no longer pointed at the end near the vein. Hydrogels can be used. It is also possible to attach additional structures, e.g. coil-like structures.
  • the indwelling vein cannula or compo nents especially the venous catheter and / or the puncture needle, from her before a lead into a patient by the user to the individual course or the individual anatomical expression of the vein, eg. B. by bending or deforming can be adjusted.
  • Materials and / or surface coatings can have fluorescent properties.
  • Materials and / or surface coatings can also change color or change in general due to metabolic activities, e.g. due to the metabolic activities of germs, e.g. bacteria.
  • a discoloration or change due to the patient's own metabolic activities is also conceivable.
  • the length of time an indwelling venous cannula or a venous catheter has been in place can be determined and monitored.
  • the material properties can also be monitored in this way. It is conceivable that the material properties of the venous catheter change if it is in place for a longer period of time or if there are material defects, e.g. breaks or tears in the venous catheter. For example, the electrical conductivity can change. If a current is now applied via a conductive venous catheter, it can be determined whether the venous catheter has been damaged. It is also conceivable that the venous catheter changes properties that make it less, more or differently visible in an ultrasound or X-ray image.
  • the material can be checked regularly, especially if venous catheters or indwelling vein cannulas have been in the patient for a long time.
  • the length of stay can also be checked in this way.
  • the venous catheter has properties that make it visible in an X-ray or bacterial infestation Make ultrasound control less, more or differently visible. For example, it can be determined whether a venous catheter could be the source of blood poisoning (sepsis). In this way, unnecessary catheter changes can potentially also be avoided. Electrically charged materials can also advantageously be used.
  • the venous catheter is electrically charged, for example negatively charged, due to special material properties on its outside, and thus automatically pushes itself off or moves away from the rather negatively charged inner vein wall (intima). By reducing the mechanical irritation, potential injuries to the vein wall can now be avoided.
  • the above materials can all also be used on all sections, parts and / or components of the intravenous cannula that are set up to remain outside of the patient.
  • Figure 1 A schematic representation of an indwelling venous cannula in a
  • Figure 1 shows a schematic representation of an indwelling venous cannula 1 in a side view.
  • the indwelling venous cannula 1 has a venous catheter 2, and a puncture needle 3 can be guided in the venous catheter 2 in a longitudinally displaceable manner.
  • the indwelling vein cannula 1 is designed as a peripheral indwelling vein cannula 1. It is clear that the venous catheter 2 was formed like a tightly wound spiral spring from a puncture-proof material, so that a wave-shaped upper surface is created. The venous catheter 2 consists of a puncture-proof material over its entire length. The flexibility of the venous catheter 2 is guaranteed by the spiral structure. Such a design of the venous catheter 2 provides stab and cut protection which protects the venous catheter 2, for example, from being pierced by a tip 6 of the puncture needle 3 close to the patient when the intravenous cannula 1 is applied. Thus, the risk of a damaged venous catheter 2 is minimized.
  • the venous catheter 2 is provided with a sealing coating 4 for improved aspiration.
  • the undulating surface can create minimal openings that make aspiration more difficult, as air can be drawn in through these openings, for example.
  • a sealing coating 4 can minimize or prevent undesired aspiration of air.
  • the sealing coating 4 is advantageously a PTFE coating, which at the same time facilitates the introduction of the venous catheter 2 into the punctured part of the body.
  • An additional dilation element 10 at the end of the venous catheter 2 near the patient achieves a uniform expansion when the venous catheter 2 is advanced in the punctured body part.
  • the application of the indwelling venous cannula 1 to a living being can take place, for example, in the following steps:
  • the indwelling venous cannula 1 has two holding elements 5. These holding elements 5 enable the user to operate the indwelling venous cannula 1 with one hand, where the second hand can be used, for example, to stabilize the body part to be punctured.
  • the puncture needle 3 is designed as a hollow needle. After he punctured through the near-patient tip 6 of the puncture needle 3, the user can immediately see whether the vein has been correctly punctured by the hollow puncture needle 3 filling with venous blood and entering the chamber 7, whereby the blood through the user directly can be perceived.
  • the venous catheter 2 can be pushed into the punctured body part and the puncture needle 3 together with the chamber 7 can be pulled out of the components of the indwelling venous cannula 1 remaining in the body part.
  • a safety mechanism can be designed so that the patient-near tip 6 of the puncture needle 3 is shielded after being pulled out of the indwelling venous cannula 1 and thus protects the user and the living being from possible stab injuries.
  • the venous catheter 2 can be held fixed to the living being in its end position in the punctured body part via fastening elements 8.
  • the fixation can be done by a self-adhesive wound dressing that fixes the Venenverweilka tube 1 via the fastening elements 8 on the living being.
  • the described fastening elements 8, which can be designed as wings, for example, are optional elements of the indwelling venous cannula 1.
  • the puncture needle can run essentially in the middle between the Hal teimplantationn 5 and / or the fastening elements 8.
  • connection element 9 can be designed as a valve that enables simple administration of medication or aspiration of blood. In the pristine state, the valve prevents fluids, such as blood, from flowing out of the connection element 9 retrograde. In addition, in the pristine state the valve prevents air from entering the connection element 9 from the outside.
  • the connection element 9 can also contain a filter , which prevents the penetration of coarse particles, bacteria and air into the interior of the connection element 9 and thus into the interior of the intravenous cannula.
  • An aspiration element such as a syringe can be connected to the chamber 7.
  • the indwelling venous cannula can thus be inserted into a vein with constant aspiration with the syringe.
  • the success of the puncture can thus be determined directly and very precisely.
  • Chamber 7 can also be designed as a further valve which allows the flow of fluids in only one defined direction.
  • the chamber 7 can alternatively or additionally also be designed in such a way that it prevents the penetration of air or air and allows other gases and vapors to pass through only in a defined direction.
  • the chamber 7 can be designed in the same way as the connection element 9, for example.
  • the chamber 7 and the connection element 9 can be covered by a protective cap so that undesirable contamination does not occur when the chamber 7 and the connection element 9 are not used.
  • the protective cap can be connected to the chamber 7 and / or to the connection element 9 via a tab.
  • the venous catheter 2 has recesses 11 distributed over the circumference at the end close to the patient.
  • the recesses 11 can be used to achieve a homogeneous delivery of, for example, a drug into the living being. An undesirable, locally highly concentrated release of the drug into the living being is thus avoided.
  • the flow rates of the applied infusion solutions and drugs can also be increased. In addition, this can facilitate the aspiration of fluids, e.g. a blood sample, from the living being via the lying venous catheter or via the lying venous indwelling cannula.
  • a desired retrograde spontaneous escape of fluids, vapors and / or gases from the venous cannula can be possible, for example if they are used for draining fluids, vapors and / or gases, e.g. as part of a puncture the pleural space, other cavities or the interbody spaces described above should be used.
  • FIG. 1 is understood as a possible embodiment.
  • Other forms of teaching according to the invention are still conceivable.
  • the configurations of the exemplary embodiment are not inextricably linked with one another, so that, for example, the implementation of the invention is not dependent on the specifically described configurations of the exemplary embodiment. Variability, for example in the number, length or size of the individual elements, is conceivable at any time.

Abstract

Canule veineuse à demeure (1) destinée à être appliquée sur un être vivant comportant un cathéter veineux (2), une aiguille de ponction (3) pouvant être guidée de manière déplaçable longitudinalement dans le cathéter veineux (2). L'aiguille de ponction (3) est réalisée sous la forme d'une aiguille creuse sur une partie de sa longueur, une partie supplémentaire de la longueur de l'aiguille de ponction (3) étant conçue pour être au moins partiellement pleine.
PCT/EP2020/087404 2019-12-20 2020-12-21 Canule veineuse à demeure WO2021144123A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20842219.6A EP4076614A1 (fr) 2019-12-20 2020-12-21 Canule veineuse à demeure
US17/786,835 US20230020179A1 (en) 2019-12-20 2020-12-21 Indwelling venous cannula
CN202080095919.7A CN115052650A (zh) 2019-12-20 2020-12-21 静脉留置套管

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019135505 2019-12-20
DE102019135505.2 2019-12-20

Publications (1)

Publication Number Publication Date
WO2021144123A1 true WO2021144123A1 (fr) 2021-07-22

Family

ID=74186637

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/087404 WO2021144123A1 (fr) 2019-12-20 2020-12-21 Canule veineuse à demeure

Country Status (4)

Country Link
US (1) US20230020179A1 (fr)
EP (1) EP4076614A1 (fr)
CN (1) CN115052650A (fr)
WO (1) WO2021144123A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021115847A1 (de) 2021-06-18 2022-12-22 Ebnet Medical Gmbh Punktionsvorrichtung
DE102022121022A1 (de) 2022-08-19 2024-02-22 Ebnet Medical Gmbh Medizinisches Zugangssystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734095A (en) * 1971-05-21 1973-05-22 L Santomieri Fluid infusion
DE4041720A1 (de) 1990-12-24 1992-06-25 Feldmann Michael Venenverweilkanuele
US5649911A (en) * 1996-05-17 1997-07-22 Indiana University Foundation Intravenous catheter and delivery system
US20130023826A1 (en) * 2010-03-26 2013-01-24 Terumo Kabushiki Kaisha Indwelling needle assembly
DE202018101646U1 (de) * 2018-03-23 2019-06-27 Jens Ebnet Venenverweilkanüle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368730A (en) * 1981-02-12 1983-01-18 Nigel Sharrock Intravenous catheter
US8308691B2 (en) * 2006-11-03 2012-11-13 B. Braun Melsungen Ag Catheter assembly and components thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734095A (en) * 1971-05-21 1973-05-22 L Santomieri Fluid infusion
DE4041720A1 (de) 1990-12-24 1992-06-25 Feldmann Michael Venenverweilkanuele
US5649911A (en) * 1996-05-17 1997-07-22 Indiana University Foundation Intravenous catheter and delivery system
US20130023826A1 (en) * 2010-03-26 2013-01-24 Terumo Kabushiki Kaisha Indwelling needle assembly
DE202018101646U1 (de) * 2018-03-23 2019-06-27 Jens Ebnet Venenverweilkanüle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021115847A1 (de) 2021-06-18 2022-12-22 Ebnet Medical Gmbh Punktionsvorrichtung
DE102021115847A8 (de) 2021-06-18 2023-06-01 Ebnet Medical Gmbh Punktionsvorrichtung
DE102022121022A1 (de) 2022-08-19 2024-02-22 Ebnet Medical Gmbh Medizinisches Zugangssystem

Also Published As

Publication number Publication date
CN115052650A (zh) 2022-09-13
EP4076614A1 (fr) 2022-10-26
US20230020179A1 (en) 2023-01-19

Similar Documents

Publication Publication Date Title
JP6633149B2 (ja) 弁を用いたアクセス装置
DE60028244T2 (de) Auftrennbares medizinisches ventil
EP3746167B1 (fr) Système de ponction
US6045734A (en) Process of making a catheter
DE60106260T2 (de) Medizinische vorrichtung mit geflecht und spule
DE60210961T2 (de) Katheter mit niedrigwiderstandsseptum
CN105228689B (zh) 多用途的静脉导管组件隔膜和隔膜致动器
EP3328478B1 (fr) Système de ponction
EP0864336B1 (fr) Cathéter avec mécanisme à vanne
DE2842153C2 (de) Anschlußstück für Katheter
EP0547463A1 (fr) Dispositif d'introduction pour cathéter
DE202013012593U1 (de) Flüssigkeitsaustausch-Katheter
DE3927001A1 (de) Kathetersystem
DE3148117A1 (de) Physiologisches fluid-shuntsystem und verbesserungen fuer dieses system
DE3641107A1 (de) Subkutane eingabevorrichtung
EP2209516A1 (fr) Appareil médical sous forme de cathéter conçu pour administrer, mais notamment pour évacuer un fluide dans des cavités corporelles, notamment hors des cavités corporelles, en particulier de la cavité pleurale
EP3768365A2 (fr) Canule veineuse à demeure
US20110313399A1 (en) Intravenous cannula
DE602004013072T2 (de) Nadelschutz mit Merkmalen zum Führen einer Sonde
WO2021144123A1 (fr) Canule veineuse à demeure
US20210283377A1 (en) Arterial access needle with proximal port
WO2022263550A2 (fr) Canule à demeure
DE102021115847A1 (de) Punktionsvorrichtung
US11638805B2 (en) Multi-headed catheter for fluid delivery
DE102007050840A1 (de) Infusionsvorrichtung

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20842219

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020842219

Country of ref document: EP

Effective date: 20220720